Automatic damper



April 1931' w. F. JAEGER 1,800,076

AUTOMEXTIC DAMPER Filed Oct. 10, 1929 2 SheetsSheet 1 April 7, 1931. w F, JAEGER 1,800,076

AUTOMATIC DAMPER Filed Oct. 10, 1929 2 Sheets-Sheet 2 gwumtou (la eye). H

Patented Apr. 7, 1931 NT. OFFICE WALTER I. JAEGER, 01.7,RACINE, WISCONSIN AUTOMATIC DAMPER Application filed October 10, 1929. Serial 110.398,?60.

This invention relates to an automatic damper adapted for use in chimneys or discharge fiues or pipes of stoves, furnaces and the like.

The main object is to provide a construc tion of damper which will automatically vary its position to open or close the passageway in order to regulate the draft so as to particularly diminish the draft in the event the stove or furnace unduly heats or overheats, so as to avoid the fire hazard and enable operation with a minimum amount of coal or fuel.

Various additional objects and advantages will become apparent from a consideration of the description following taken in connection with accompanyin drawings illustrating an operative embod'ment.

In said drawings Figure l is a view illustrating the improved damper in plan, the discharge flue or the like being shown in section and suggested in dotted lines,

Figure 2 is a side elevation of the parts of Figure 1,

Figure 3 is a detail section taken on the line 33 of Figure 1,

Figure 4 is a detail section taken on the line 4-4 of Figure 1,

Figure 5 is an end view showing the improvements in place within a flue,

Figure 6 is a detail sectional view taken on the line 66 of Figure 1,

Figure 7 is a longitudinal sectional view taken on the line 7-7 of Figure 1,

Figure 8 is a cross sectional view taken on the line 8-8 of Figure 1, and

Figure 9 is a cross sectional view taken on the line 9-9 of Figure 7.

Referring specifically to the drawings, 10 desi nates a conventional pipe, chimney or discharge flue leading from a stove, furnace or the like. Within the flue 10 a skeleton frame 11 is disposed either permanently, or frictionally as preferred. The frame 11 has a substantially rectangularsection 12 and a .cross member 13 at one end fastened thereto at 14. At the other end a cross member 15 is fastened to the frame 11, as at 16, the ends being offset as shown.

ed shank 33 which passes At opposite sides of the frame 11, longitudinally extending thermostats 17 are disposed, the same being bi-metallic and for instance each consisting of an inner strip 18 of iron and an outer strip 19 of brass. 55 Such strips may be riveted together or otherwise secured as at 20 and they may be fastened at one end as by rivets or the like 21 to the frame 11. One ofthe strips 19 is bent to form an arm 22 while the other o0 strip 19 has an arm 23 pivotally connected thereto at 24. The damper is shown in the form of a disk as at 25. Brackets 26 are riveted as at 27 to the damper and upright pintles 28 by means of trunnions 29 05 are journaled in said brackets. The arms 22 and 23 have adjustable clamp sections 30 and rigid clamp sections 31, at their inner ends, which are rigidly fastened to the rods 28 by bolts 32.

As a result of the construction described, the thermostats 17 will be affected by heat and under the action thereof will bend inwardly or toward each other, thereby moving the arms 22 and 23 inwardly and ac cordingly tilting damper 25 to restrict the passageway through the flue 10 or the position of the damper 25 var ing automatically according to the degree of heat to which the thermostats 17 are subjected. Q In order to vary the tension of the thermostats to better control the automatic action of the damper 25, either or both of the thermostats 17 may have an adjusting or tensioning device such as is detailed in Fi 8 ure 4. This device comprises a screw threadloosely through the thermostats 17 and wall of the flue 10 but which is screw threaded to part of frame 12 through which it passes. Such adjusting device 33 carries a manipulating handle 34 outside of the conduit 10. Thus the handle 34 may be turned to accordingly cause the thermostats to move therewith or to permit inward yielding thereof. 9

Various changes may be resorted to provided they fall within the spirit and scope of the invention.

I claim as my invention 1. A device of the class described compris- 1 7 of said members, a damper, pintle members pivoted to the damper, clampmeans carried by said arms to engage said pintle members ing a frame, thermostatic membersextending therefrom, an arm extending from one of said members, an arm pivoted to the other of said members, a damper, pintle members pivoted to the damper, and clamp means carried by said arms to engage said pintle members on opposite sides of the damper.

2. A device of the class described comprising a frame, thermostatic members extending therefrom, an arm extending from one of said members, an arm pivoted to the other on opposite sides of the damper, and means mounted in theframe operable to vary the tension of one of said thermostats.

In testimony whereof I aflix my signature. WALTER F. JAEGEJR. 

